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Sexual Selection - Coggle Diagram
Sexual Selection
Assymmetries in Sexual Reproduction
Differences in mating behavior
Sexual Dimorphism
defined as the different in form or behavior between males and females of a species
Competitive sex
experiences strong selective pressure
participates in intrasexual selection by fighting among themselves
"Choosy" sex
experiences weak selective pressure
participates in intersexual selection
If sexual selection is to explain differences between the sexes, it will have to act on the sexes differently
cost associated to the offspring
in many animals (but not all), eggs/pregnancies are more experiences than ejaculates
female devotes 3x the energy required to maintain basal metabolism
male devotes 1/1000x the energy required for basal metabolism
Differential Reproductive Success
sex-related:
high success rate for males
limited by # of females they can mate with
low success rate for females
limited by # of eggs and pregnancies they can metabolically achieve
Parental investment
increases reproductive success of offspring recieving it
decreases remaining reproductive success for potential future offspring
In most animals, neither parent cares for the young past birth/egg-laying
defined as a form of natural selection which promotes traits that help organisms acquire mates
if there is heritable variation in a trait that affects the ability to obtain mates, then variants conducive to success will become more common over time
"Reproduction of the fittest"